Improvement in valves for blowing-engines



-. sinned mes gstellt @ffm LEWIS .TAWs or PHILADELPHA, PENNSYLVANIA.

Letters Patent I Vo. 87,728, dated .Ma/rch 9, 1869.

IMPnovr-:MENT m vALvns ron BILOWINGENGINES.

The Schedule referred Viro-in these Letters Pattern: and making of the same.

To all whom it concern Be itknown that I, LEWIS TAWS, of Philadelphia, Pennsylvania, have invented certain-Improvements in Valves for Blowing-Cylinders; and I do hereby declare the followingr to` be a full, clear, and exact description of thesame;

My invention consists in the application, to a'blowing-cylinder, of a number of independent inlet and outlet-valves, constructed for separate detachability, with `their seats from the valve-chambers of Vthe, cylinder,

allsubstautially as described hereafter, so as to avoid the expense and delay incurred in renewing the larger valves heretoforeused in connection with blowing-cylinders for blasts ofhigh pressure.

lIn order to enable othersv skilled in the art to make -and apply my invention, I will now proceed to describe its construction and operation, reference being had to the accompanying drawing,whicl 1 forms a part of this specification,v and in which-.- a

Figure 1, Drawing No. 1represents a vertical section -of part of my improved inlet-valve.

Figure `2, a sectional plan, on the line 1-2, iig. 1.

Figure 3, Drawing No.2,.is a vertical section of the' outlet-valve. V i p Figure 4, a sectional plan, on the line 3 4, g. 3.. The cylinders of blowing-.engines are usually proy vided at each end with chamber, air being admitted through one part of each-chamber to vthe interior of the cylinder, .to be subsequently forced therefrom in a compressed state, through the 4other parts of each chamber.

It is the practice to interpose, between these chambers and the cylinder,inlet and outlet-valves, of large area, Vthe valves being composedof sheets or bands of prepared rubber. y 1

Owing to the softening effector' the heat, developed by the compression of the air, the rubber is apt to become deteriorated, and incapable of performing the proper functions of a valve,` and-moreA especially is this the case in engines which have to discharge a blast at the high pressure demanded in practising the Bessemer process of manufacturing iron and steel.

y The sudden injury of o'neof the -valves is a source of great inconvenience, loss, and delay, which it is the 'purpose of my invention to obviate.

Instead of valves of large area, I apply to a blowing-cylinder a number o f small valves, in the manner whiclilI will now proceed to describe. a

On leference to Drawing No.1, A represents a portion of one end of a blowing-cylinder,between which, and the plate D, intervene the valves andseats.

E is a hollow cylinder, having openings a at the side, `and at the upper edge a flange, b, through which pass bolts or set-screws, 'for securing the cylinder to the plate'D, the latter having an lopening,'d, for the admission of, but somewhat larger than the cylinder,

"the upper edge of lwhich'is fitted snugly to the said cross-bar, e, and bolts or studs lt.

' A number of these valve-seats are thus fitted to the valve-chambers of a blowing-cylinder, the number being commensurate with thediameter of the latter', and the air passes from the valve-chamber, through the side openings ct a., and through the grated seat F, into the interior of the blowing-cylinder, to-beforced therefrom through the grated seat of the outlet-valves, one of which is illustrated in iig. 2.

In this case the cylinder E is closed at the top, and-` the prepared-rubber valve G is necessarily secured to the top of the grated valve-seat F, through which the compressed air is forced into the cylinder E, and thence, through the openings a a of the same, into the valvechamber B.

In other respects theoutlet-valve and its adjuncts, shown in .Drawing No.2,"are too similar to those described cu reference to.Drawing Notl, to render a minute description of the former necessary.

In both cases there are two prominent features, namely, the limited area of the valves, and the ready detachability of the entire valve and seat from its position4 in the chamber,.and the ready introduction and adjustment of a supplementary valve and its appurtenances. 1

The valves may belvaried 4in diameter, but I may remark here, thatI have applied seven inlet and four outlet-valves, each nine inches in diameter, to a blowing-cylinder of ifty-seven inches in diameter.

Ihe rubber valves being of limited-area, are necessarily less liable to be damaged than thelargcr valves u heretofore used, and should one of these valves become injured, all that is necessary is to withdraw the nuts 'of the bolts or studs which secure the cylinders E to the plate D, then withdraw the entire cylinder with its seat and damaged valve, and replace the same with a supplementary1 valve, which should be kept on hand for the purpose.

These operations can be readily accomplished, and

with out that expense and delay whichmust be incurred in renewing., the ordinary large and comparatively in-V .accessible valves of blowing-engines.:

' I'v claim as my invention, and desire to secure by Letters Patent- 1. The combination, ywith 'a blowingcylinder,;of a

plurality of independent detachable valve-seats and- In testimony whereof', I have signed my name to valves, all substantially as and for the purpose dethis specification, in the presence of two subscribing scribed. l l witnesses 2. The cylinder E, with its side openings a, g'rated seat F, and rubber valve, the whole being constructedv Vtitnesses;V for ready adjustment in, and as ready withdrawal from E. H. BAILEY, the chamber of 'a blowing-cylinder,A substantially as vHARRY SMITH. and for the purpose herein set forth.

LEWIS TAWS. 

